Redundant Hot-Plug Power Supplies - Compaq ProLiant 8500 Technology Brief

TC000604TB
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ECHNOLOGY RIEF
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Redundant Hot-Plug Power Supplies

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The ProLiant 8500 server uses one of the newest Compaq technologies to reduce downtime:
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intelligent, redundant, hot-plug power supplies. The server supports two dual-rated
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1150-watt/500-watt power supplies with new handles for easier insertion and removal. Even if one
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of these power supplies fails, its internal fans will continue to operate and help cool the server. A
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single power supply running at 220 volts can support a fully loaded ProLiant 8500 server, but a
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second power supply adds redundancy and fault tolerance.
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The power supplies have an embedded microcontroller and an inter-integrated circuit bus that
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communicates the status back to the system health drivers.
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information to the IMD and to Compaq Insight Manager.
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The microcontroller performs the following functions:
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Self-test. The intelligent power supplies perform their own power-on self-test (POST) that
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checks temperature, RAM integrity, ROM version, analog-to-digital conversion accuracy, and
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nonvolatile memory integrity of the power supply.
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Auto Line Sensing. Because the power supplies are rated for both 1150 watts (at 220 volts)
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and 500 watts (at 110 volts), a line-sensing feature automatically recognizes which line voltage
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is connected. The customer does not need to configure the supply for voltage.
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LED Standby Controls. The microcontroller also drives two status light-emitting diodes
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(LEDs) on the back of the power supply that indicate power status, as shown in Figure 9. This
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gives the user vital status information at a glance.
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Figure 9: Power supply LED status indicators.
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For additional details about Compaq's intelligent power supplies, see the technology brief
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Intelligent Power Supply Technology, document number ECG016/0198.
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(cont.)
Clear - Front panel power switch off or open interlock
Flashing Green - Power on delay or software power off
Green - Outputs on and good
Flashing Amber - Failed self test
Amber - Outputs failed
Flashing Amber/Green - Restart failed
Green - AC power good
Clear - AC power not good
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The health drivers then send status